when you are making a building with concrete it looks like legos in a pink tone with black stripes, this happens with black concrete since if this is used for roads in cities from legos you will see those black and pink stripes, I think all concrete blocks you have this error but with the color black or dark colors it shows more, this error was already in previous versions but it was solved already, for you be specific I think it was in the villagers and pillager update, this error was solved but it returned